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Posted to common-dev@hadoop.apache.org by "Koji Noguchi (JIRA)" <ji...@apache.org> on 2008/04/22 03:41:21 UTC
[jira] Commented: (HADOOP-3294) distcp leaves empty blocks afte
successful execution
[ https://issues.apache.org/jira/browse/HADOOP-3294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591163#action_12591163 ]
Koji Noguchi commented on HADOOP-3294:
--------------------------------------
It may be unrelated, but do you have a speculative execution turned on?
> distcp leaves empty blocks afte successful execution
> ----------------------------------------------------
>
> Key: HADOOP-3294
> URL: https://issues.apache.org/jira/browse/HADOOP-3294
> Project: Hadoop Core
> Issue Type: Bug
> Components: util
> Affects Versions: 0.16.3
> Environment: 0.16.3 without any patches. Dfs permissions turned off everywhere, such that HADOOP-3138 and HADOOP-3186 do not apply
> Reporter: Christian Kunz
>
> I copied around 40 TB between two hadoop clusters, with distcp running on source.
> Job was *successful*, but one destination file was empty because of its only block being empty.
> None of the distcp log files have any mentioning of this file.
> There were a couple of messages in the namenode server log of the destination cluster referencing the file:
> hadoop-xxxnamenode-yyy.log.2008-04-19:2008-04-19 02:19:15,666 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.allocateBlock: destinationDir/_distcp_tmp_z0g93p/fileName. blk_-9209890281741927376
> hadoop-xxx-namenode-yyy.log.2008-04-19:2008-04-19 02:54:45,820 WARN org.apache.hadoop.dfs.StateChange: DIR* NameSystem.internalReleaseCreate: attempt to release a create lock on destinationDir/_distcp_tmp_z0g93p/fileName file does not exist.
> distcp should not rely on the user to double-check.
> Would it make sense to add a reducer to compare destination file sizes with source files sizes and do some appropriate action?
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